Low-voltage power breaker with a rating plug

ABSTRACT

A rating plug may be provided with an electrical coding such that unsuitable identification of the rating plug is not transmitted to the trigger unit, but rather the attempt to make use of such a rating plug leads to a signal. The signaling unit is arranged on the housing of the low-voltage power breaker, or on the trigger unit. Thus, if the rating plug is the wrong rating plug, wrong contact connection and a defective rating plug may be recorded.

This application is the national phase under 35 U.S.C. § 371 of PCTInternational Application No. PCT/DE01/04038 which has an Internationalfiling date of Oct. 19, 2001, which designated the United States ofAmerica and which claims priority on German Patent Application number DE100 54 436.3 filed Oct. 26, 2000, the entire contents of which arehereby incorporated herein by reference.

FIELD OF THE INVENTION

The invention generally relates to a low-voltage power circuit breakerhaving a rated-current plug connector. More preferably, by use of such apower circuit breaker, the electronic tripping unit of the power circuitbreaker can be matched to the conditions where it is used. Theevaluation device of the tripping unit preferably sets minimum usersettings, and a signal is preferably output by a signaling device whenan unsuitable rated-current plug connector is used.

BACKGROUND OF THE INVENTION

Power circuit breakers in the low-voltage range should be suitable foruse in as wide a rated-current range as possible, for example 200 A to6300 A. It should therefore be possible to select their rated current.By setting a specific rated current, the appropriate overcurrent releaseparameters are set for a selected rated current. The overcurrent releasemay thus be physically the same for the whole rated-current range.

It is known for overcurrent releases to be equipped with a plug-inrated-current plug connector (rating plug) which is fitted withresistors, for example, and by use of which one or more characteristicvalues can be determined for the switch. It is thus not possible tooperate the switch without the rated-current plug connector.

A rated-current plug connector is known, for example, from U.S. Pat. No.4,649,455. If the rated-current plug connector according to thissolution is taken out of the switch, for example in order to replace itwith a rated-current plug connector having different user settings, thetripping unit sets itself automatically to a minimum tripping valueuntil a rated-current plug connector has been inserted again. In thesimplest case, this is achieved by a setting resistor, which isconnected electrically in parallel with the setting resistors in therated-current plug connector, being arranged fixedly in the trippingunit and determining the rated current when the rated-current plugconnector is removed.

In order to prevent unsuitable rated-current plug connectors, whichwould set a rated current outside the rating limits for the powercircuit breaker, from being used, it is known, for example from U.S.Pat. No. 5,027,091, to mechanically code the rated-current plugconnector using key-coding.

DE-A 198 45 825 also discloses a solution which uses electrical codingso that unsuitable characteristic values for the rated-current plugconnector are not transferred to the tripping unit but, when an attemptis made to use such a rated-current plug connector, a signal is output.The signaling device should be arranged on the rated-current plugconnector. A fault signal is output only when the rated-current plugconnector is inserted. It is not possible in this way to indicate faultssuch as the absence of a contact connection between the rated-currentplug connector and the tripping unit or the complete absence of arated-current plug connector.

SUMMARY OF THE INVENTION

An embodiment of the invention is based on an object of furtherincreasing the safety of power circuit breakers with regard to the useand the operation of rated-current plug connectors which are suitablefor the power circuit breaker and the use of complex mechanical coding.

An object may be achieved according to an embodiment of the invention.Accordingly, the signaling device is arranged on the enclosure of thelow-voltage power circuit breaker or on the tripping unit.

The signaling device may be an audible and/or visual signal transmitter,exactly as envisaged in DE-A 198 45 825, for example a blinkinglight-emitting diode.

If there are no rating values on the input lines of the plug connectionto the rated-current plug connector which are suitable for the relevantpower circuit breaker, the evaluation device of the tripping unit sendsa signal to the signaling device. In this way, even the states “norated-current plug connector”, “no contact connection”, and “defectiverated-current plug connector” are also recognized.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention is explained in more detail below with reference to anexemplary embodiment. The associated drawing shows a low-voltage powercircuit breaker having an associated tripping unit and a rated-currentplug connector.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

A circuit 12 is monitored by a power circuit breaker 1. A result isthat, if impermissible current values are present across contacts 2operated by a drive device 3, the circuit is interrupted. The current inthe circuit 12 is measured using a current sensor 4. The measured valueis processed in a tripping unit 5.

The tripping unit 5 includes a microprocessor 6, a read device 7 and anevaluation device 8. A rated-current plug connector 9 may be inserted inthe enclosure of the power circuit breaker 1 and is then connected tothe tripping unit 5 via contacts 11. The rated-current plug connector 9contains the coding for the rated current and, if required, furthervalues, in the simplest case in the form of resistances of definedmagnitude.

The values read by the read device 7 are compared in the evaluationdevice 8 with the permissible values for the relevant power circuitbreaker 1. If they are within the permissible limits, they aretransferred to the tripping device 5. However, if they are notpermissible values because, for example, the rated-current plugconnector 9 has been removed, the tripping device 5 transmits apulsating signal to an LED 10. The LED 10 then blinks and signals to theuser that there is a fault. At the same time, the user settings for thetripping unit 5 are changed to minimum values. The signaling and theminimizing of the user settings remain active until a permissiblerated-current plug connector has been inserted again.

Instead of being arranged on the enclosure of the power circuit breaker1, it is also possible for the signaling device to be integrateddirectly in the tripping unit 5.

LIST OF REFERENCE NUMERALS

-   1 Power circuit breaker-   2 Contacts-   3 Drive device-   4 Current sensor-   5 Tripping unit-   6 Microprocessor-   7 Read device-   8 Evaluation device-   9 Rated-current plug connector-   10 LED-   11 Contacts-   12 Circuit

The invention being thus described, it will be obvious that the same maybe varied in many ways. Such variations are not to be regarded as adeparture from the spirit and scope of the invention, and all suchmodifications as would be obvious to one skilled in the art are intendedto be included within the scope of the following claims.

1. A low-voltage power circuit breaker, comprising: a rated-current plug connector; an electronic tripping unit, setting operating conditions based upon suitable rated current plug inserted in the rated-current plug connector; and a signaling device arranged on at least one of an enclosure of the low-voltage power circuit breaker and the electronic tripping unit, the signaling device outputting a signal and the electronic tripping unit setting minimum settings for the electronic tripping unit being set upon at least one of a suitable rated current plug being removed from the rated-current plug connector and an unsuitable rated-current plug being inserted in the rated-current plug connector.
 2. The low-voltage power breaker as claimed in claim 1, wherein the signaling device is at least one of an audible and a visual signal transmitter.
 3. The low-voltage power breaker as claimed in claim 1, wherein the signaling device is a blinking light-emitting diode.
 4. The low-voltage power breaker as claimed in claim 1, wherein if there are no user settings, on input lines of the plug connection to the rated-current plug connector, which are suitable for the relevant low-voltage power circuit breaker, a signal for operating the signaling device is sent.
 5. The low-voltage power breaker as claimed in claim 2, wherein the signaling device is a blinking light-emitting diode.
 6. The low-voltage power breaker as claimed in claim 2, wherein if there are no user settings, on input lines of the plug connection to the rated-current plug connector, which are suitable for the relevant low-voltage power circuit breaker, a signal for operating the signaling device is sent.
 7. The low-voltage power breaker as claimed in claim 3, wherein if there are no user settings, on input lines of the plug connection to the rated-current plug connector, which are suitable for the relevant low-voltage power circuit breaker, a signal for operating the signaling device is sent.
 8. The low-voltage power breaker as claimed in claim 4, wherein if there are no user settings, on input lines of the plug connection to the rated-current plug connector, which are suitable for the relevant low-voltage power circuit breaker, a signal for operating the signaling device is sent.
 9. The low-voltage power breaker as claimed in claim 5, wherein if there are no user settings, on input lines of the plug connection to the rated-current plug connector, which are suitable for the relevant low-voltage power circuit breaker, a signal for operating the signaling device is sent.
 10. A low-voltage power circuit breaker, comprising: a rated-current plug connecting means for adjusting operating conditions of an electronic tripping unit of the power circuit breaker based upon a suitable rated current plug inserted in the rated-current plug connector; and signaling means, arranged on at least one of an enclosure of the low-voltage power circuit breaker and the electronic tripping unit, for outputting a signal, the signaling means outputting a signal and minimum settings for the electronic tripping unit being set, upon at least one of a suitable rated current plug being removed from the rated-current plug connecting means and an unsuitable rated-current plug being inserted in the rated-current plug connecting means.
 11. The low-voltage power breaker as claimed in claim 10, wherein the signaling means includes at least one of an audible and a visual signal transmitter.
 12. The low-voltage power breaker as claimed in claim 10, wherein the signaling means includes a blinking light-emitting diode.
 13. The low-voltage power breaker as claimed in claim 10, wherein if there are no user settings, on input lines of the plug connection to the rated-current plug connecting means, which are suitable for the relevant low-voltage power circuit breaker, a signal for operating the signaling means is sent.
 14. The low-voltage power breaker as claimed in claim 11, wherein the signaling means includes a blinking light-emitting diode.
 15. The low-voltage power breaker as claimed in claim 11, wherein if there are no user settings, on input lines of the plug connection to the rated-current plug connecting means, which are suitable for the relevant low-voltage power circuit breaker, a signal for operating the signaling means is sent.
 16. The low-voltage power breaker as claimed in claim 12, wherein if there are no user settings, on input lines of the plug connection to the rated-current plug connecting means, which are suitable for the relevant low-voltage power circuit breaker, a signal for operating the signaling means is sent.
 17. The low-voltage power breaker as claimed in claim 13, wherein if there are no user settings, on input lines of the plug connection to the rated-current plug connecting means, which are suitable for the relevant low-voltage power circuit breaker, a signal for operating the signaling means is sent.
 18. The low-voltage power breaker as claimed in claim 14, wherein if there are no user settings, on input lines of the plug connection to the rated-current plug connecting means, which are suitable for the relevant low-voltage power circuit breaker, a signal for operating the signaling means is sent. 